Largest Muni ETF at Highest Premium With Fund Outflows Slowing

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The biggest exchange-traded fund tracking the $3.7 trillion U.S. municipal-bond market is selling at the highest premium to the value of its assets since May.

The $3.1 billion iShares National AMT-Free Muni Bond ETF, known as MUB, sold at 0.28 percent more than the worth of its holdings as of Jan. 10, the highest since May, data compiled by Bloomberg show. For the first time since May, the fund sold at a premium for two straight days.